1. Hi,



    OS: Ubuntu Server 12.04.5/RAID1 (Ubuntu Software RAID)


    After setting up RAID1 and partitioning/formatting 2 ekstra harddrives, I suddenly noticed this warning:

    Disk /dev/md1 doesn't contain a valid partition table

    What is this? Why does this warning appear? OS is installed on a ext4 partition and works just fine, so I'm not really sure what think about this ;)

    Here's some information:
    Code:
    # fdisk -l
    
    Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
    255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 4096 bytes
    I/O size (minimum/optimal): 4096 bytes / 4096 bytes
    Disk identifier: 0x000a01de
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sdb1            2048  1953520064   976759008+  83  Linux
    
    Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
    255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 4096 bytes
    I/O size (minimum/optimal): 4096 bytes / 4096 bytes
    Disk identifier: 0x00066956
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sda1            2048  1953520064   976759008+  83  Linux
    
    Disk /dev/sdc: 2000.4 GB, 2000398934016 bytes
    255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 4096 bytes
    I/O size (minimum/optimal): 4096 bytes / 4096 bytes
    Disk identifier: 0x0003b949
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sdc1            2048     3905535     1951744   fd  Linux raid autodetect
    /dev/sdc2   *     3905536  3907028991  1951561728   fd  Linux raid autodetect
    
    Disk /dev/sdd: 2000.4 GB, 2000398934016 bytes
    255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 4096 bytes
    I/O size (minimum/optimal): 4096 bytes / 4096 bytes
    Disk identifier: 0x0001a342
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sdd1            2048     3905535     1951744   fd  Linux raid autodetect
    /dev/sdd2   *     3905536  3907028991  1951561728   fd  Linux raid autodetect
    
    Disk /dev/md0: 1997 MB, 1997471744 bytes
    2 heads, 4 sectors/track, 487664 cylinders, total 3901312 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 4096 bytes
    I/O size (minimum/optimal): 4096 bytes / 4096 bytes
    Disk identifier: 0x00000000
    
    Disk /dev/md0 doesn't contain a valid partition table
    
    Disk /dev/md1: 1998.3 GB, 1998264795136 bytes
    2 heads, 4 sectors/track, 487857616 cylinders, total 3902860928 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 4096 bytes
    I/O size (minimum/optimal): 4096 bytes / 4096 bytes
    Disk identifier: 0x00000000
    
    Disk /dev/md1 doesn't contain a valid partition table
    .
     
  2. srijan

    srijan New Member HowtoForge Supporter

  3. Hi Srijan,


    After reading the whole post I don't think, that this can't be it. I did my own ToDo and followed it to the letter two times. First time using smaller drives (for the RAID) and no problem occured. It has to be related to drivesize or something completely different. I'm not sure what to do.

    I know I made partitions and I created a "swap" on the first "MD" and "EXT4" filesystem on the other "MD".

    Problem/warning occured on a clean installation. And it's Ubuntu Software RAID. It might behave different than a hardware RAID. Anyway, I can't see the solution in the post/thread :eek:


    Code:
    # cat /proc/mdstat
    Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
    md1 : active raid1 sdd2[1] sdc2[0]
          1951430464 blocks super 1.2 [2/2] [UU]
    
    md0 : active raid1 sdc1[0] sdd1[1]
          1950656 blocks super 1.2 [2/2] [UU]
    
    unused devices: <none>

    Code:
    # mdadm -D /dev/md0
    /dev/md0:
            Version : 1.2
      Creation Time : Thu Sep 11 18:02:01 2014
         Raid Level : raid1
         Array Size : 1950656 (1905.26 MiB 1997.47 MB)
      Used Dev Size : 1950656 (1905.26 MiB 1997.47 MB)
       Raid Devices : 2
      Total Devices : 2
        Persistence : Superblock is persistent
    
        Update Time : Sat Sep 13 05:30:28 2014
              State : clean
     Active Devices : 2
    Working Devices : 2
     Failed Devices : 0
      Spare Devices : 0
    
               Name : whitley:0  (local to host whitley)
               UUID : 3b140885:c51adadc:2a254c37:07d07dfe
             Events : 17
    
        Number   Major   Minor   RaidDevice State
           0       8       33        0      active sync   /dev/sdc1
           1       8       49        1      active sync   /dev/sdd1

    Code:
    # mdadm -D /dev/md1
    /dev/md1:
            Version : 1.2
      Creation Time : Thu Sep 11 18:03:46 2014
         Raid Level : raid1
         Array Size : 1951430464 (1861.03 GiB 1998.26 GB)
      Used Dev Size : 1951430464 (1861.03 GiB 1998.26 GB)
       Raid Devices : 2
      Total Devices : 2
        Persistence : Superblock is persistent
    
        Update Time : Thu Sep 25 08:42:22 2014
              State : clean
     Active Devices : 2
    Working Devices : 2
     Failed Devices : 0
      Spare Devices : 0
    
               Name : whitley:1  (local to host whitley)
               UUID : b400ee33:6ebb4f32:18bde492:62934e66
             Events : 79
    
        Number   Major   Minor   RaidDevice State
           0       8       34        0      active sync   /dev/sdc2
           1       8       50        1      active sync   /dev/sdd2

    Another thing is, that I haven't understod the whole showing partition issue, using UUID or /dev/* . But here's "fstab". using a combination. :eek:

    Code:
    # /etc/fstab: static file system information.
    #
    # Use 'blkid' to print the universally unique identifier for a
    # device; this may be used with UUID= as a more robust way to name devices
    # that works even if disks are added and removed. See fstab(5).
    #
    # <file system> <mount point>   <type>  <options>       <dump>  <pass>
    proc            /proc           proc    nodev,noexec,nosuid 0       0
    # / was on /dev/md1 during installation
    UUID=e1c18cc4-dd50-4ceb-b5ca-1b2f6e843302 /               ext4    errors=remount-ro 0       1
    # swap was on /dev/md0 during installation
    UUID=66761273-d381-47fd-ba8a-9f6b4b41c6b2 none            swap    sw              0       0
    /dev/sda1 /media/backupdisk1 ntfs defaults,uid=1000,rw  0       0
    /dev/sdd1 /media/backupdisk2 ext4 rw,user,exec  0       0

    And:

    Code:
    # mdadm -E /dev/sdc1
    /dev/sdc1:
              Magic : a92b4efc
            Version : 1.2
        Feature Map : 0x0
         Array UUID : 3b140885:c51adadc:2a254c37:07d07dfe
               Name : whitley:0  (local to host whitley)
      Creation Time : Thu Sep 11 18:02:01 2014
         Raid Level : raid1
       Raid Devices : 2
    
     Avail Dev Size : 3901440 (1905.32 MiB 1997.54 MB)
         Array Size : 1950656 (1905.26 MiB 1997.47 MB)
      Used Dev Size : 3901312 (1905.26 MiB 1997.47 MB)
        Data Offset : 2048 sectors
       Super Offset : 8 sectors
              State : clean
        Device UUID : cfc1ac9c:da5182bc:a1244995:fc7adf2d
    
        Update Time : Sat Sep 13 05:30:28 2014
           Checksum : b4708e37 - correct
             Events : 17
    
       Device Role : Active device 0
       Array State : AA ('A' == active, '.' == missing)
    
    
    # mdadm -E /dev/sdd1
    /dev/sdd1:
              Magic : a92b4efc
            Version : 1.2
        Feature Map : 0x0
         Array UUID : 3b140885:c51adadc:2a254c37:07d07dfe
               Name : whitley:0  (local to host whitley)
      Creation Time : Thu Sep 11 18:02:01 2014
         Raid Level : raid1
       Raid Devices : 2
    
     Avail Dev Size : 3901440 (1905.32 MiB 1997.54 MB)
         Array Size : 1950656 (1905.26 MiB 1997.47 MB)
      Used Dev Size : 3901312 (1905.26 MiB 1997.47 MB)
        Data Offset : 2048 sectors
       Super Offset : 8 sectors
              State : clean
        Device UUID : f533f6ed:2c2b05c0:745a018a:5d56a5df
    
        Update Time : Sat Sep 13 05:30:28 2014
           Checksum : afbaeae5 - correct
             Events : 17
    
       Device Role : Active device 1
       Array State : AA ('A' == active, '.' == missing)
    Code:
    # mdadm -E /dev/sdc2
    /dev/sdc2:
              Magic : a92b4efc
            Version : 1.2
        Feature Map : 0x0
         Array UUID : b400ee33:6ebb4f32:18bde492:62934e66
               Name : whitley:1  (local to host whitley)
      Creation Time : Thu Sep 11 18:03:46 2014
         Raid Level : raid1
       Raid Devices : 2
    
     Avail Dev Size : 3902861312 (1861.03 GiB 1998.26 GB)
         Array Size : 1951430464 (1861.03 GiB 1998.26 GB)
      Used Dev Size : 3902860928 (1861.03 GiB 1998.26 GB)
        Data Offset : 262144 sectors
       Super Offset : 8 sectors
              State : clean
        Device UUID : e6353303:6ee81fe3:376694ef:0c448ec5
    
        Update Time : Thu Sep 25 10:17:42 2014
           Checksum : cc3268ee - correct
             Events : 79
    
       Device Role : Active device 0
       Array State : AA ('A' == active, '.' == missing)
    
    
    # mdadm -E /dev/sdd2
    /dev/sdd2:
              Magic : a92b4efc
            Version : 1.2
        Feature Map : 0x0
         Array UUID : b400ee33:6ebb4f32:18bde492:62934e66
               Name : whitley:1  (local to host whitley)
      Creation Time : Thu Sep 11 18:03:46 2014
         Raid Level : raid1
       Raid Devices : 2
    
     Avail Dev Size : 3902861312 (1861.03 GiB 1998.26 GB)
         Array Size : 1951430464 (1861.03 GiB 1998.26 GB)
      Used Dev Size : 3902860928 (1861.03 GiB 1998.26 GB)
        Data Offset : 262144 sectors
       Super Offset : 8 sectors
              State : clean
        Device UUID : d99969e0:98ade3d9:c369a15b:7706c2bc
    
        Update Time : Thu Sep 25 10:17:42 2014
           Checksum : 36d5804 - correct
             Events : 79
    
       Device Role : Active device 1
       Array State : AA ('A' == active, '.' == missing)

    Code:
    # blkid
    /dev/sdb1: UUID="8696fa40-c4df-4fdc-9f97-b361fc5ce09a" TYPE="ext4"
    /dev/sdc1: UUID="3b140885-c51a-dadc-2a25-4c3707d07dfe" UUID_SUB="cfc1ac9c-da51-82bc-a124-4995fc7adf2d" LABEL="whitley:0" TYPE="linux_raid_member"
    /dev/sdc2: UUID="b400ee33-6ebb-4f32-18bd-e49262934e66" UUID_SUB="e6353303-6ee8-1fe3-3766-94ef0c448ec5" LABEL="whitley:1" TYPE="linux_raid_member"
    /dev/sdd1: UUID="3b140885-c51a-dadc-2a25-4c3707d07dfe" UUID_SUB="f533f6ed-2c2b-05c0-745a-018a5d56a5df" LABEL="whitley:0" TYPE="linux_raid_member"
    /dev/sdd2: UUID="b400ee33-6ebb-4f32-18bd-e49262934e66" UUID_SUB="d99969e0-98ad-e3d9-c369-a15b7706c2bc" LABEL="whitley:1" TYPE="linux_raid_member"
    /dev/md0: UUID="66761273-d381-47fd-ba8a-9f6b4b41c6b2" TYPE="swap"
    /dev/md1: UUID="e1c18cc4-dd50-4ceb-b5ca-1b2f6e843302" TYPE="ext4"
     
    Last edited: Sep 25, 2014

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